Uploading PayFast payment gateway

Hi,
Over a week ago I uploaded the Payfast plugin to wordpress and it showed up in store settings-Payments, but then i just disappeared. I have tried to upload again since then by copying the "wp-content" into the base wordpress file via FTP as suggested on the website instructions ( https://www.payfast.co.za/developers/marketpress#where_is_my_base_wordpress_folder )

Can you suggest anything? I dont understand why it disappeared, or why it wont pick up again.

Any help will be great.
Thanks,
Karen